Check if installed Qt version supports Format_Grayscale16

python-pillow · Dec 14, 2021 · e87745d · e87745d
1 parent b1cc094
commit e87745d
Show file tree

Hide file tree

Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/Tests/test_imageqt.py b/Tests/test_imageqt.py
@@ -42,8 +42,11 @@ def checkrgb(r, g, b):
 
 
 def test_image():
-    for mode in ("1", "RGB", "RGBA", "L", "P", "I;16"):
+    for mode in ("1", "RGB", "RGBA", "L", "P"):
         ImageQt.ImageQt(hopper(mode))
+    qt_format = ImageQt.QImage.Format if ImageQt.qt_version == "6" else ImageQt.QImage
+    if hasattr(qt_format, "Format_Grayscale16"):  # Qt 5.13+
+        ImageQt.ImageQt(hopper("I;16"))
 
 
 def test_closed_file():

diff --git a/src/PIL/ImageQt.py b/src/PIL/ImageQt.py
@@ -167,7 +167,7 @@ def _toqclass_helper(im):
     elif im.mode == "RGBA":
         data = im.tobytes("raw", "BGRA")
         format = qt_format.Format_ARGB32
-    elif im.mode == "I;16":
+    elif im.mode == "I;16" and hasattr(qt_format, "Format_Grayscale16"):  # Qt 5.13+
         format = qt_format.Format_Grayscale16
     else:
         if exclusive_fp: